<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - shadow map</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
	</head>

	<body>

		<div id="info">
		<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - shadowmap - models by <a href="https://mirada.com/" target="_blank" rel="noopener">mirada</a> from <a href="http://www.ro.me" target="_blank" rel="noopener">rome</a><br />
		move camera with WASD / RF + mouse
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			import Stats from 'three/addons/libs/stats.module.js';

			import { FirstPersonControls } from 'three/addons/controls/FirstPersonControls.js';
			import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
			import { FontLoader } from 'three/addons/loaders/FontLoader.js';
			import { TextGeometry } from 'three/addons/geometries/TextGeometry.js';

			const SHADOW_MAP_WIDTH = 2048, SHADOW_MAP_HEIGHT = 1024;

			let SCREEN_WIDTH = window.innerWidth;
			let SCREEN_HEIGHT = window.innerHeight;
			const FLOOR = - 250;

			const ANIMATION_GROUPS = 25;

			let camera, controls, scene, renderer;
			let stats;

			const NEAR = 5, FAR = 3000;

			let morph, mixer;

			const morphs = [], animGroups = [];

			const clock = new THREE.Clock();

			init();

			function init() {

				const container = document.createElement( 'div' );
				document.body.appendChild( container );

				// CAMERA

				camera = new THREE.PerspectiveCamera( 23, SCREEN_WIDTH / SCREEN_HEIGHT, NEAR, FAR );
				camera.position.set( 700, 50, 1900 );

				// SCENE

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x59472b );
				scene.fog = new THREE.Fog( 0x59472b, 1000, FAR );

				// LIGHTS

				const ambient = new THREE.AmbientLight( 0xffffff );
				scene.add( ambient );

				const light = new THREE.DirectionalLight( 0xffffff, 3 );
				light.position.set( 0, 1500, 1000 );
				light.castShadow = true;
				light.shadow.camera.top = 2000;
				light.shadow.camera.bottom = - 2000;
				light.shadow.camera.left = - 2000;
				light.shadow.camera.right = 2000;
				light.shadow.camera.near = 1200;
				light.shadow.camera.far = 2500;
				light.shadow.bias = 0.0001;

				light.shadow.mapSize.width = SHADOW_MAP_WIDTH;
				light.shadow.mapSize.height = SHADOW_MAP_HEIGHT;

				scene.add( light );

				createScene();

				// RENDERER

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );
				renderer.setAnimationLoop( animate );
				container.appendChild( renderer.domElement );

				renderer.autoClear = false;

				//

				renderer.shadowMap.enabled = true;
				renderer.shadowMap.type = THREE.PCFSoftShadowMap;

				// CONTROLS

				controls = new FirstPersonControls( camera, renderer.domElement );

				controls.lookSpeed = 0.0125;
				controls.movementSpeed = 500;
				controls.lookVertical = true;

				controls.lookAt( scene.position );

				// STATS

				stats = new Stats();
				container.appendChild( stats.dom );

				//

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

				SCREEN_WIDTH = window.innerWidth;
				SCREEN_HEIGHT = window.innerHeight;

				camera.aspect = SCREEN_WIDTH / SCREEN_HEIGHT;
				camera.updateProjectionMatrix();

				renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );

				controls.handleResize();

			}

			function createScene( ) {

				// GROUND

				const geometry = new THREE.PlaneGeometry( 100, 100 );
				const planeMaterial = new THREE.MeshPhongMaterial( { color: 0xffdd99 } );

				const ground = new THREE.Mesh( geometry, planeMaterial );

				ground.position.set( 0, FLOOR, 0 );
				ground.rotation.x = - Math.PI / 2;
				ground.scale.set( 100, 100, 100 );

				ground.castShadow = false;
				ground.receiveShadow = true;

				scene.add( ground );

				// TEXT

				const loader = new FontLoader();
				loader.load( 'fonts/helvetiker_bold.typeface.json', function ( font ) {

					const textGeo = new TextGeometry( 'THREE.JS', {

						font: font,

						size: 200,
						depth: 50,
						curveSegments: 12,

						bevelThickness: 2,
						bevelSize: 5,
						bevelEnabled: true

					} );

					textGeo.computeBoundingBox();
					const centerOffset = - 0.5 * ( textGeo.boundingBox.max.x - textGeo.boundingBox.min.x );

					const textMaterial = new THREE.MeshPhongMaterial( { color: 0xff0000, specular: 0xffffff } );

					const mesh = new THREE.Mesh( textGeo, textMaterial );
					mesh.position.x = centerOffset;
					mesh.position.y = FLOOR + 67;

					mesh.castShadow = true;
					mesh.receiveShadow = true;

					scene.add( mesh );

				} );

				// CUBES

				const cubes1 = new THREE.Mesh( new THREE.BoxGeometry( 1500, 220, 150 ), planeMaterial );

				cubes1.position.y = FLOOR - 50;
				cubes1.position.z = 20;

				cubes1.castShadow = true;
				cubes1.receiveShadow = true;

				scene.add( cubes1 );

				const cubes2 = new THREE.Mesh( new THREE.BoxGeometry( 1600, 170, 250 ), planeMaterial );

				cubes2.position.y = FLOOR - 50;
				cubes2.position.z = 20;

				cubes2.castShadow = true;
				cubes2.receiveShadow = true;

				scene.add( cubes2 );

				mixer = new THREE.AnimationMixer( scene );

				for ( let i = 0; i !== ANIMATION_GROUPS; ++ i ) {

					const group = new THREE.AnimationObjectGroup();
					animGroups.push( group );

				}

				// MORPHS

				function addMorph( mesh, clip, speed, duration, x, y, z, fudgeColor, massOptimization ) {

					mesh = mesh.clone();
					mesh.material = mesh.material.clone();

					if ( fudgeColor ) {

						mesh.material.color.offsetHSL( 0, Math.random() * 0.5 - 0.25, Math.random() * 0.5 - 0.25 );

					}

					mesh.speed = speed;

					if ( massOptimization ) {

						const index = Math.floor( Math.random() * ANIMATION_GROUPS ),
							animGroup = animGroups[ index ];

						animGroup.add( mesh );

						if ( ! mixer.existingAction( clip, animGroup ) ) {

							const randomness = 0.6 * Math.random() - 0.3;
							const phase = ( index + randomness ) / ANIMATION_GROUPS;

							mixer.clipAction( clip, animGroup ).
								setDuration( duration ).
								startAt( - duration * phase ).
								play();

						}

					} else {

						mixer.clipAction( clip, mesh ).
							setDuration( duration ).
							startAt( - duration * Math.random() ).
							play();

					}

					mesh.position.set( x, y, z );
					mesh.rotation.y = Math.PI / 2;

					mesh.castShadow = true;
					mesh.receiveShadow = true;

					scene.add( mesh );

					morphs.push( mesh );

				}

				const gltfLoader = new GLTFLoader();
				gltfLoader.load( 'models/gltf/Horse.glb', function ( gltf ) {

					const mesh = gltf.scene.children[ 0 ];
					const clip = gltf.animations[ 0 ];

					for ( let i = - 600; i < 601; i += 2 ) {

						addMorph( mesh, clip, 550, 1, 100 - Math.random() * 3000, FLOOR, i, true, true );

					}

				} );

			}

			//

			function animate() {

				stats.begin();
				render();
				stats.end();

			}

			function render() {

				const delta = clock.getDelta();

				if ( mixer ) mixer.update( delta );

				for ( let i = 0; i < morphs.length; i ++ ) {

					morph = morphs[ i ];

					morph.position.x += morph.speed * delta;

					if ( morph.position.x > 2000 ) {

						morph.position.x = - 1000 - Math.random() * 500;

					}

				}

				controls.update( delta );

				renderer.clear();
				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>
